Made some progress this weekend. Installed an alarm, wired up the box control panel, sorted out some wiring and installed LEDS in the light for the cab.
Nice build! I plan on stealing some of your ideas. It never occured to me to mount a window AC unit so that it vents into one of the outside access compartments. I need to get busy converting my interior lights to LED.
Once all the wiring is done, I have a shroud that will go over the ac so I don't have to keep the compartment open to run it. However it does work very well.